Production of formic acid.



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FEGDUCTIQN 0F FGEMZC ACID,

aces-see, 7 sp is new n w. Patented July or, rear. lilo "Brewing.nppficetion filed July 21, 1915. Serial No. 41,169.

To all whom tit may concern In general if prefer applying low toni- Beit known that I, GEORG'BREDIG, a sub peratures and high pressure. ect ofthe German Emperor, and resident Instead of Water, other suitablesolvents of liarlsruhe, Badenia, Germany, have insuch as ethyl ether,alcohol, others, hetones E rented certain new -and usefulimproveparafiinor liquid acids may be used.

ments in the Production of Formic Acid, I am aware that it has beenproposed to of which the following is a specification. reduce carbonoxids by aid of hydrogen .gas 7 My invention relates to the productionof under pressure and in the presence of cats formic acid. lysts, but ithad not been possible to obtain F:

to In a rior application filed December 4th, in this Way formic acid,much less in a dis- 1914, er. No. 875466, I have described a solvedstate. process for producing'formiatesby treating I claim bicarbonatesor a mixture of carbonates and 1. The process for producing formic acidcarbonic acid in the presence of a catalytic which consists insubjecting a mixture of f in active substance and under high'pressure,hydrogen and carbon (llOKlCl to high preswith hydrogen, either alone ormixed with sure in the presence of a catalyst and of a carbonic acidgas, the formiates thus obsolvent. tained being converted into formicacid, if 2. The process for producing formic acid d i which consists insub ecting a mixture of i r so According to the presentin ention formichydrogen, carbon dioxid, a catalyst and a acid is obtained directly andWithout emsolvent to high pressure. p

ploying an alkali or a salt, the formic acid 3. The process forproducing formic acid being obtained direct from carbon dioxid whichconsists in acting upon carbon dioxid {carbonic acid) by reduction withordi- With hydrogen in the presence ofa catalyst 25 nary hydrogen gasunder high pressure and comprising a metal of the platinum group in thepresence of catalytically active suband a solvent, high pressure beingmainstances, such as a metal of the platinum tained in the reactionvessel. group, and a solvent such as Water. 4:. The process forproducing formic acid in the pract ce of my invention 1 proceed Whichconsists in subjectings mixture of i W for instance as follows: hydrogenand carbon dioind to high, pres 150 com. of Water and 3 g. palladiumsure in the presence of Water and of a black are vigorously stirred in aclosed vescatalyst.

sel "With a gas mixture consisting of say 64 5. The process forproducing formic acid per cent. hydrogen gas and 36 per cent. can whichconsists in subjectinga mixture of 3 35 bon dioxid gas, a pressure of110 atmoshydrogen and carbon dionicl to high pres pheres beingmaintained Within the vessel. sure in the presence of Water and of aAccording to the temperature which is becatalyst comprising palladium.low 100 door. 3.. after some time a pure In testimony whereof I havesignedmy dilute solution of formic acid is obtained. name to thisspecification in the presence of to if a temperature (if 20 (16%;. C.had geen two subscribing witnesses.

maintained, this so ution Wi. contain a out w m 1 percent, formic acid.If a still higher CEORG BREEZE?" pressure is applied, the output offormic Witnesses: acid will increase considerably. The solu- FnmonmomMooney, E5 tion' obtained maybe concentrated in any C. Irrnnss lBnoWy.Well known manner.

